I was using MX player 1.7.28 with bubbleupnp (in local renderer model). What bubbleupnp does is: it takes a local video and creates a http server, which is later streamed using mx player (i actually need to stream a local file via http... don't ask :D)

Well everything was working fine with 1.7.28, but when I updated to lattest beta (1.7.39), MX started being laggy using the same method.

Strange errors.